Korean Journal of Agricultural Science (농업과학연구)

Institute of Agricultural Science, CNU (충남대학교 농업과학연구소)
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Adverse effect of IL-6 on the in vitro maturation of porcine oocytes

  • Yi, Young-Joo (Department of Agricultural Education, College of Education, Sunchon National University) ;
  • Adikari, Adikari Arachchige Dilki Indrachapa (Department of Agricultural Education, College of Education, Sunchon National University) ;
  • Moon, Seung-Tae (Department of Agricultural Education, College of Education, Sunchon National University) ;
  • Heo, Jung-Min (Department of Animal Science and Biotechnology, Chungnam National University) ;
  • Lee, Sang-Myeong (Laboratory of Veterinary Virology, College of Veterinary Medicine, Chungbuk National University)
  • Received : 2021.07.13
  • Accepted : 2021.08.18
  • Published : 2021.09.01
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Abstract

Cytokines are protein mediators that possess the ability to assist cell-to-cell communication in immune system-related activities. In general, pathogen endotoxins activate the release of inflammatory mediators, and with time, there is an increase in the cytokine levels in the body. Interleukin (IL)-6 mediates the acute-phase inflammatory response, and elevated IL-6 levels have been reported in peritoneal fluids of women with pelvic inflammation and endometriosis, thereby associating it with oocyte quality and infertility. To overcome subfertility or infertility in humans and animals, the present study was done to examine the effect of recombinant IL-6 on porcine oocytes matured in vitro and subsequently to determine the fertilization rate and embryo development. Porcine oocytes were incubated with varying concentrations of IL-6 (0 - 2 ㎍·mL-1) for 44 h followed by in vitro fertilization and culturing of the oocytes. The oocytes or embryos were fixed with 3.7% paraformaldehyde (PFA) and stained with fluorescence dyes, and the meiotic spindle, chromosome organization, fertilization status and embryo development were subsequently assessed under a fluorescence microscope. We observed induction of an abnormal meiotic spindle alignment in the oocytes incubated with IL-6 compared to the control oocytes incubated without IL-6. Moreover, significantly decreased fertilization rates and embryo development were observed for oocytes incubated with IL-6 (p < 0.05). Thus, an increased IL-6 level during oocyte maturation could be associated with fertilization failure due to an aberrant chromosomal alignment and a disruption of the cortical granules. Taken together, our results indicate that successful assisted reproduction can be achieved by controlling the levels of inflammatory cytokines.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (NRF- 2013R1A6A3A04063769 and NRF-2020R1A2C1014007).

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